San Juan volcanic field, Volcanic mountain range in southwestern Colorado, United States
San Juan volcanic field is a large area of volcanic mountains in southwestern Colorado. It contains multiple volcanic structures, including several calderas and lava formations that shape the landscape.
The region formed from intense volcanic activity about 35 to 40 million years ago. Eruptions reached their peak between about 35 and 30 million years ago.
The area takes its name from the nearby San Juan Mountains and serves as a place where visitors can experience the raw power of volcanic geology firsthand. The jagged landscapes and steep slopes visible today shape how people move through and relate to this dramatic terrain.
Visitors can explore the region on various hiking trails that cross through different volcanic features and geological formations. Trails range in difficulty and length to suit different abilities and experience levels.
The region holds significant deposits of lead, zinc, copper, gold, and silver concentrated in rock fractures around the calderas. These mineral deposits formed through volcanic processes that continued after the calderas were created.
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